Without the sectioned parts to be welded being firmly secured, the molten alloy welding spot, when cooling down, will always shrink towards the center of the mass, thus pulling the sectioned parts inwards and up.

When the parts are secured with the Joker, the direction of shrinkage is guided downwards, which is the only direction that does not negatively influence the fit.

Without the sectioned parts to be welded being firmly secured, the molten alloy welding spot, when cooling down, will always shrink towards the center of the mass, thus pulling the sectioned parts inwards and up.

When the parts are secured with the Joker, the direction of shrinkage is guided downwards, which is the only direction that does not negatively influence the fit.